Hydrogen and Helium-4 in thermodynamic equilibrium

In thermodynamical equilibrium what would be the proportion of hydrogen to helium-4? According to the proton-proton chain branch I it would seem that the equilibrium would be 75% H-25% He-4? is this correct? (This is of course an unrealistic scenario).

In thermodynamical equilibrium what would be the proportion of hydrogen to helium-4? According to the proton-proton chain branch I it would seem that the equilibrium would be 75% H-25% He-4? is this correct? (This is of course an unrealistic scenario).

In nuclear statistical equilibrium, everything would be iron. P-P causes hydrogen to fuse into helium, but there aren't any significant processes going the other way.